Finance Receivables and Loans, Net (Schedule of Accounts, Notes, Loans and Financing Receivables) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 136,304	$ 135,748
Unamortized premiums and discounts and deferred fees and costs	2,300	2,300
Accrued interest receivable	726	707
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	106,815	106,610
Consumer | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	83,640	83,286
Consumer | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	19,461	19,735
Consumer | Mortgage Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	19,189	19,445
Interest-only mortgage loans	2	3
Consumer | Mortgage - Legacy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	272	290
Interest-only mortgage loans	16	17
Consumer | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	3,714	3,589
Fair value, option, carrying amount, financing receivable, no allowance	2	3	$ 7	$ 7
Consumer | Personal Lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	2,074	1,990
Consumer | Credit Card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	1,640	1,599
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	29,489	29,138
Commercial | Automotive
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	14,905	14,595
Commercial | Consumer mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	5,509	5,389
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total finance receivables and loans	$ 9,075	$ 9,154